
from django.db import models
from django.contrib.auth.models import User

class UserPreferences(models.Model):
    user = models.OneToOneField(User)
    language = models.CharField(max_length=2, blank=True, null=True)
    theme = models.CharField(max_length=10, blank=True, null=True)
    layout = models.TextField(blank=True, null=True )


from django.conf import settings

if not 'django.contrib.admin' in settings.INSTALLED_APPS:

    from django.contrib.contenttypes.models import ContentType
    from django.contrib.auth.models import User
    from django.contrib.admin.util import quote
    from django.utils.translation import ugettext_lazy as _
    from django.utils.encoding import smart_unicode
    from django.utils.safestring import mark_safe
    
    ADDITION = 1
    CHANGE = 2
    DELETION = 3
    
    class LogEntryManager(models.Manager):
        def log_action(self, user_id, content_type_id, object_id, object_repr, action_flag, change_message=''):
            e = self.model(None, None, user_id, content_type_id, smart_unicode(object_id), object_repr[:200], action_flag, change_message)
            e.save()
    
    class LogEntry(models.Model):
        action_time = models.DateTimeField(_('action time'), auto_now=True)
        user = models.ForeignKey(User)
        content_type = models.ForeignKey(ContentType, blank=True, null=True)
        object_id = models.TextField(_('object id'), blank=True, null=True)
        object_repr = models.CharField(_('object repr'), max_length=200)
        action_flag = models.PositiveSmallIntegerField(_('action flag'))
        change_message = models.TextField(_('change message'), blank=True)
        objects = LogEntryManager()
        class Meta:
            verbose_name = _('log entry')
            verbose_name_plural = _('log entries')
            db_table = 'django_admin_log'
            ordering = ('-action_time',)
    
        def __repr__(self):
            return smart_unicode(self.action_time)
    
        def is_addition(self):
            return self.action_flag == ADDITION
    
        def is_change(self):
            return self.action_flag == CHANGE
    
        def is_deletion(self):
            return self.action_flag == DELETION
    
        def get_edited_object(self):
            "Returns the edited object represented by this log entry"
            return self.content_type.get_object_for_this_type(pk=self.object_id)
    
        def get_admin_url(self):
            """
            Returns the admin URL to edit the object represented by this log entry.
            This is relative to the Django admin index page.
            """
            return mark_safe(u"%s/%s/%s/" % (self.content_type.app_label, self.content_type.model, quote(self.object_id)))
